CBSE Class 10 Science Quiz | CBSE Class 10 Science MCQs with Answers

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Questions
101 an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is:
A 10 cm
B 5 cm
C 20 cm
D 18 cm

Answer: 10 cm
102 A lens of focal length 12 cm forms an erect image, three times the size of the object. The distance between the object and image is:
A 8 cm
B 36 cm
C 16 cm
D 24 cm

Answer: 8 cm
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103 A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light:
A Is reflected along the same path
B Does not get refracted
C Is refracted towards the normal
D Is refracted away from the normal

Answer: Does not get refracted
104 Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same:
A Mirror A is concave and mirror B is plane
B Mirror A is convex and mirror B is concave
C Mirror A is concave and mirror B is convex
D Mirror A is plane and mirror B is concave

Answer: Mirror A is concave and mirror B is plane
105 A concave mirror produces a magnification of +4. The object is placed:
A Beyond the centre of curvature
B Between focus and pole
C At the focus
D Between focus and centre of curvature

Answer: Between focus and pole
106 Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used?
A 35 cm
B 20 cm
C 10 cm
D 30 cm

Answer: 10 cm
107 An object is placed at 100 mm in front of a concave mirror which produces an upright image (erect image). The radius of curvature of the mirror is:
A More than 200 mm
B Exactly 200 mm
C Less than 100 mm
D Between 100 mm and 200 mm

Answer: More than 200 mm
108 An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is:
A 2 cm
B 22 cm
C 4 cm
D 10 cm

Answer: 2 cm
109 Blue colour of the sky is due to the phenomenon of:
A Scattering of light
B Dispersion of light
C Reflection of light
D Refraction of light

Answer: Scattering of light
110 The star appear shifted from their actual position due to the phenomenon of:
A Reflection of light
B Refraction of light
C Scattering of light
D Diffraction of light

Answer: Refraction of light
111 When a beam of white light falls on a glass prism, the colour of light which will deviate least is:
A Red
B Blue
C Violet
D Green

Answer: Red
112 A man finds it difficult to read the odometer on the dashboard of the car but is able to clearly read a distant road sign. Which of the following statement is correct about this man?
A The far point of his eyes has come closer to him.
B The near point of his eyes has receded away.
C The near point of his eyes has come closer to him.
D The far point of his eyes has receded away.

Answer: The near point of his eyes has receded away.
113 A got his eye tested. The optician’s prescription for the spectacles was: Left eye: −3 D Right eye: −3.50 D The person is having a defect of vision called:
A Presbyopia
B Myopia
C Astigmatism
D Hypermetropia

Answer: Myopia
114 A person cannot see the distant objects clearly (though he can see the nearby objects clearly). He is suffering from the defect of vision called:
A Myopia
B Presbyopia
C Cataract
D Hypermetropia

Answer: Myopia
115 How eyes adjust in order to focus the image of near or distant objects on retina?
A The lens moves in or out according to the position of the object
B The retina moves in or out according to the position of the object
C The lens becomes thicker or thinner according to the position of the object
D The pupil gets larger or smaller according to the position of the object

Answer: The lens becomes thicker or thinner according to the position of the object
116 The term “accommodation” as applied to the eye, refers to its ability to:
A Control the light intensity falling on the retina
B Erect the inverted image formed on the retina
C Adjust the focal length of the lens
D Vary the distance between the lens and retina

Answer: Adjust the focal length of the lens
117 The frequency of electricity produced by DC generator is equal to
A 0 Hz
B 200 Hz
C 50 Hz
D 100 Hz

Answer: 0 Hz
118 An electric motor is a device which transforms
A Electrical energy into mechanical energy
B Electrical energy into Potential energy
C Kinetic energy into potential energy
D Mechanical energy into electrical energy

Answer: Electrical energy into mechanical energy
119 The shape of the magnetic field lines produced by a current carrying conductor are:
A Concentric circles
B Concentric parabolas
C Straight lines
D Concentric ellipse

Answer: Concentric circles
120 A fuse should always be placed in the
A Earth wire of the main circuit
B Live wire of the main circuit
C Neutral wire of the main circuit
D Bothe live and neutral wire of the main circuit.

Answer: Live wire of the main circuit

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